1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7763f37b87eb9def38764e67ebbf35306e242ea99cd809594eb2c4797898d18e. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/08f6f06a-bc5c-4a2b-b9c6-7dc5173e20f5.json and https://artists.proofprofile.net/proofs/artist/08f6f06a-bc5c-4a2b-b9c6-7dc5173e20f5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3c154e9d1ca923516682126a408d0e851370f80ddd7dec184ec65a60d4808d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKJ6A1410302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519d01c8f8f97e8b869c6ba0617d0e99a366ec965604e1627ae371a4fb5784db. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKJ6A1410304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef837dfc676fcb14d7d3213c9dada219a5343facdc1618f2d964ae75445d243e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKJ6A1410306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x254eb78d3c2b5e8f210c7c5e36cf1a69de3e2c9866abb5554c10f8e3f72c3086. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKJ6A1350803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dee3a450e7158ec68abfddedc343f2adde6b60c12d32a2000903c260f0409ec. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKJ6A1350806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x097fc7d6cd0cdaaaed7b8de369f2008885c2d109b6a5f16fa4c72f0357a8eaca. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKJ6A1350808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e33f54b9fff901ad4c0630926fc0102c45c950752555d881b10af1f1081d0f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKJ6A1350809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09eec1e66b12a962806137a2317f57fe6846f959c7718bc7f5d50dfdaddcc957. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKJ6A1350810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x639001bfa742d5cc56371e7e70e16b45980c82f7e5ebfafe3e81888de3070e7e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKJ6A1352601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda6e4dca342bd0b6904103a59d539ea0ed954dd9da77626b2cdcfce5542a2baa. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKJ6A1350914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87670ca7b5f8b636becdc78dc31eccfb7ee379a5321938819fca2883aaf447fd. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKJ6A1352515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda762a69631c3cf3c816332b1bd8daf96299d08dd0c1ba5b25209ef9acfc3f7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKJ6A1352302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x254eb78d3c2b5e8f210c7c5e36cf1a69de3e2c9866abb5554c10f8e3f72c3086. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKJ6A1350803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f5702e34c739d603b22aae75cb61bcbec347088fce513fd9337a93f81b0bf4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKJ6A1351605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ed3b38dc719a1167b66d0c3489f20f8143b41dcf5c310885ed5b7c313d9b71. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKJ6A1350706.